✦ LIBER ✦

Determination of the speciation of chromium with an automated two-column ion-exchange system

✍ Scribed by P.A. Sule; J.D. Ingle Jr.

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 750 KB
Volume: 326
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(96)00041-4

No coin nor oath required. For personal study only.

✦ Synopsis

An automated two-column ion-exchange system was developed to determine the speciation of chromium in water samples. The system is based on retention of cationic Cr(III) species by Chelex-100 resin and anionic Cr(VI) species by an anion resin. The chromium species retained by the resins are eluted sequentially with stripping reagents and are detected by an on-line flame atomic absorption spectrophotometer.

Operation of valves and pumps, data acquisition, and data manipulation are controlled by a microcomputer. The detection limit with a 2 ml sample loop is 2 ng ml-' for Cr(II1) and Cr(V1). The fraction of Cr(II1) retained by the Chelex-100 varies with the pH of the solution. In the presence of humic acid, Cr(II1) forms negatively charged complexes, some of which are retained by the anion resin.

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